Locking stop valve



Jan. 18, 1938.- J. E. GLASSCOCK LOCKING STOP VALVE I 7 Filed April 15, 1937 I I W 5 [INVENTOR- A TTORNEYS.

Patented Jan. 18, 1938 UNHTED STATES PATENT QFFIE 1 Claim.

My invention relates to improvements in looking stop valves or stop cooks for use in connection with oil storage tanks.

The principal objects of my invention are to provide a device of this character which is positive in action, simple and inexpensive in construction; new, novel and easily installed; which is strong, durable, reliable and of evident utility; which cannot easily get out of order and is efiicient for the purposes for which it is intended; to provide an improved dart made in two pieces, one of said pieces having a catch at its lower end, the other of said pieces being a follower to prevent the removal of the dart from the valve; to

provide an enlarged head on the upper ends of said pieces having shoulders for seating against the top of the valve and alining holes for sealing the dart in any desired position and a chain for securing the said pieces against separation of one from the other.

With these and other objects in view my invention consists of the construction, novel feature and combination of parts hereinafter more fully described, illustrated in the accompanying onesheet drawing and pointed out in the claim hereto appended. Various changes'in the form, proportion, size, shape, weight and minor details of construction, within the scope of my invention may be resorted to without departing from the spirit or broad principle of my invention or sacrificing any of the advantages thereof.

In the accompanying drawing, Figure 1 is a top or plan view of a valve or stop cock showing the dart and seal; Fig. 2 is a side view of the same; Fig. 3 is a fragmentary sectional view of an oil tank showing one form of installation. of stop cock and Fig. 4 is one form of the two piece dart.

The valve or stop cock on the flow line from an oil tank is installed in a pit or box as shown in Fig. 3. At present the dart is inserted from the top as in my improvement but the seal is secured at the bottom of the dart on the underside of the valve. The pit usually fills up with crude oil,

mud and water and is converted into a sump. It is a very disagreeable job to reach under the valve to seal the dart and during cold stormy weather it is almost impossible to accomplish the task. With my two piece dart the sealing is done on top of the valve and it is not necessary to reach down on the under side as at present.

One embodiment of my invention is shown as follows:The valve on stop cock I is of standard 1 construction, having a spigot 2 provided with a wrench head 3 and nut 4. The barrel 5 within which spigot 2 turns has a flange 5 adjacent the head 3 of spigot 2. A rectangular opening 1 passes vertically downward through barrel 5 inside of flange 6. A corresponding rectangular opening 8 through spigot 2 is in registering alinement with the said opening I for holding the valve in open position. A similar opening 9 is at right angles to opening 8 through spigot 2 for holding the valve in closed position when dart Ill 0 and follower II are inserted in said openings.

Dart Ill has a catch I2 at its lower end. Both dart It] and follower II have heads I3 at their upper ends forming shoulders I4. Alining holes 10 45 pass through heads I3 and said heads are chained together with chain I6. In sealing the valve, dart ID is inserted in openings I and 8 and pushed down until shoulders I4 seat on top of barrel 5. Catch I2 will protrude through hole I 15 at the bottom of barrel 5 and when follower II is seated behind said dart Ill catch I2 will be forced over. so as to engage the under side of barrel 5 and be held in locked position as can best be seen in Fig. 2. Seal II will be inserted through 20 holes I5 and the valve I will be secured against unauthorized movement.

A typical installation is shown in Fig. 3. Valve I is placed in valve pit I9 under the edge of oil tank I8 on flow line so. Dart I0, follower I I and seal ll are accessible from the top and it is not necessary to reach under the valve to seal and unseal the dart as at present. The rectangular openings 8 and 9 through spigot 2 being at right angles to each other, allow dart II) and fol- 9 lower I I to seat in opening 'I' through barrel 5 and seal the valve in either open or closed position. In this specification, and in the figures the dart, follower and openings are described and shown as rectangular but they may be made in other forms. The openings may be drilled holes, the dart and follower each a half cylinder. I therefore do not confine my invention to the exact form shown and described but reserve the right to make changes in the shapes of the dart and openings.

Having thus described my invention what I claim as new and wish to secure by Letters Patent is:

In a device of the class described in combination with a stop cook or valve, a two piece dart consisting of a dart proper and a follower adapted to be seated in registering openings in the spigot and barrel of said valve, heads formed on said dart members having shoulders for seating on top 50 ofsaid barrel, said heads having alining holes for inserting a seal therethrough, a catch on the lower end of said dart member for seating under said barrel and locking in position against removal when backed up by said follower and a 55 chain for securing said dart members against separation when not in locked position.

JOHN E. GLASSCOCK. 

